GNU Collaborative International Dictionary of English

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1.       
   ‖Littorina , n. [NL. See Littoral.] (Zool.) A genus of small pectinibranch mollusks, having thick spiral shells, abundant between tides on nearly all rocky seacoasts. They feed on seaweeds. The common periwinkle is a well-known example. See Periwinkle.
   1913 Webster